Radiocontinuum PNe in the Magellanic Clouds

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Radio-continuum PNe in the Magellanic Clouds
Miroslav Filipovic (UWS) Martin Cohen
(UC) Warren Reid (MQ) Frank Stootman (UWS) Ain
De Horta (UWS) Evan Crawford (UWS) Jeff Payne
(JCU) Ivan Bojicic (MQ) Quentin Parker
(MQ) Annie Hughes (SwinU) Dejan Urosevic
(BU) Bane Vukotic (BU)
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Outline

• Radio-continuum MCs
• (Radio) Luminous Galactic/Sag Dwarf PNe
• New RC PNe from MCs
• Physics of the MCs RC PNe
• Future work

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Radio-continuum MCs
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The one idea I want you to take home with you
We do not listen to Radio Data
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Radio-continuum MCs

• New generation of Mosaic surveys
• ATCA (20,13, 6 and 3 cm)
• SUMSS (843 MHz (35cm))
• rms gt 0.5 mJy (3sgt1.5mJy)
• Resolution gt15 arcsec and lt45 arcsec
• Point source catalogue
• LMC 2000
• SMC 750
• gt95 background objects (AGN, quasars)

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Radio-continuum LMCs
? 6 cm
20 cm ?
Hughes et al. (2008)
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Radio-continuum SMCs
? 13 cm
6 cm ?
Crawford et al. (2009)
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Luminous Galactic Sag Dwarf PNe

• Galactic PNe
• G313.300.3 (Cohen et al. 2004) Slmc0.6 mJy
  (20cm)
• NGC7027 (Zijlstra et al. 2008) Slmc1.5 mJy (6cm)
• NGC6302 (Gomez et al. 1993) Slmc3.5 mJy
  Ssmc2.4 mJy (6cm)
• Sagittarius Dwarf
• 2 PNe? Dudziak et al. 2000
• Very bright! ATCA S4mJy (in LMC S2.5 mJy)
• LMC
• Zijlstra et al. 1994
• ATCA SMP L58
• at 6/3cm with S1.1/0.5 mJy

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Multi Frequency MCs

• Confusion with compact HII regions
• Optical
• Spectroscopy
• Imaging (MCELS)
• IR
• IRAS
• SPITZER (SAGE)
• X-ray
• ROSAT
• XMM Chandra

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The MCs PNe Optical Detections

• LMC
• 280 (Leisy et al. 97)
• 629 RP2006
• Total 900

• SMC
• 139
• Morgan 1995
• Jacoby De Marco 2002

MCELS (Winkler et al.)
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MCs RC PNe

• 5 RC PNe in the SMC (JD 04, SMP S11, SMP S17, JD
  26 and N S68)
• 12 RC PNe in the LMC (SMP L8,25,33,39,47,48,62,74,
  75,83,84 and 89)
• All within 2 (Optical-radio-IR) and above 3s

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MC RC PNe

• Spectral index is all-around the place
  -0.7ltalt0.4
• The SMC PNe sample significantly more luminous
  (S5mJy)
• 11 LMC RC PNe are confirmed with HST with
  diameters from very small (0.08 pc or 0.33'' SMP
  L75) to very large (1 pc or 4'' SMP L83)
• MIR/RC ratio is 92 (MW 61)
• 11 RP06 PNe reclassified

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Physics of the MCs RC PNe

• 4 RC PNe in the MCs vs 70 in the MW
• 3-5 times more luminous then in the MW
• More massive (10) then in the MW
• M(cs)lmc0.65? (Villaver et al. 2007)
• M(cs17) 2-5 M? (Payne et al. 2008)
• missing mass problem (Kwok 1994)
• Thermal vs non-thermal emission?
• Super PNe or Mini SNRs?

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Physics of the MCs RC PNe
The radio surface brightness to diameter (S -
D) (Vukotic et al. 2009) The MC RC PNe sample
is tip of the iceberg of the actual luminosity
function
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Future directions

• Deeper ATCA observations (res1 and rms0.1mJy)
• SKA (REVOLUTION!)
• Wider frequency coverage (especially low end)
• More resolution
• More sensitivity
• More HST follow-ups
• More Spitzer follow-ups
• Multi-frequency comparison